Process for the manufacture of tubular bodies



March 30, 1943. C. oBlGLlo 2,315,217

PROCESS FOR THE MANUFACTURE OF TUBULAR BODIES Fi1ed`Feb. 11, 1941 f INVENTO/a 62,2 Los Os/eL/o,

Patented Mar. 30, 1943 UNITED STATES PATENT GFFICE lPRQCESS FOR THEMANUFACTURE QF TUBULAB BUDIES by spirally winding on a central mandrelor core,

one or several bands or strips of cardboard or the like, is alreadyknown.

The improvement which forms theobject 'of this invention essentiallyconsists in providing said strips or bands, previously to Winding thesame in a tubular shape. with a band of suitable lining material, soarranged that after the spiral winding of the composite layer structurevof said strips and bands, the tubular body formed thereby will have itsinner surface entirely covered with a layer of said lining material.

By means of this method, the cost of manufacture of the tubularcontainers thereby obtained, is considerably reduced, while the perfectcontinuity of the internal lining layer permits of securing entirelywatertight containers, even when for the outer or surface layer of thetubular bodies, a porous material of rather low grade is used.

It will be understood that the internal lining may consist of thinmetallic sheet or of any other suitable material, not liable to oxidizeor corrode by the action of the product to be packed or held in thecontainer. For the same purpose thin .strips of Celluloid, Cellophane orany other suitable watertight material may conveniently be used.

The invention also has in view other objects which will appear in thecourse of the following description.

In order that the invention may be readily understood and carried intopractice without difficulty, a preferred embodiment of the same has beenshown by way of example in the illustrative drawing annexed to thisspecification and in which:

Figure 1 illustrates a piece of cardboard strip, provided with a band oflining material, which as assembled in layers are to be used for themanufacture of tubular containers by the process according to thisinvention.

Figure 2 `shows a transverse section of said strip and band of liningmaterial.

Figure 3 illustrates a modified arrangement of 55 the same strip withits band of lining material extending on both sides of the cardboardstrip.

Figure 4 is a cross section of the assembled elements of the modifiedform shown in Figure 3.

Figure 5 shows a perspective view which illustrates the process ofmanufacturing the tubular body by using the elements of Figures 1 and 2.

Figure 6 is a longitudinal section of the tubular body after assemblingthe same by the process according to this invention, as shown in Fig. l.

Figure 'I is a longitudinal sectional view of the tubular body afterassembling the same in the manner shown in Fig. 3 and Figure 8, finally,shows a further modification in the performance of the novel process ofmanufacture.

In all the said gures, the same numbers of reference are used toindicate like or corresponding parts.

The novel process according to this invention is substantially based onthe use of a, strip I (Fig. 1) of cardboard or other suitable material,adapted for forming a tubular body or container, to one of the surfacesof which is applied a band 2 which is to constitute the lining of thecontainer and which is affixed to the strip I by cementing or in anyother suitable manner.

Said band 2 of lining material may conveniently be aixed to the strip Iso as to cause one of its lateral edges to project beyond thecorresponding edge of the strip I, thereby forming a flange 3 ofsuitable width, as indicated in detail in Figures 1 and 2, or, in amodified form, so as to extend beyond both edges of said strip I, asshown in detail in Figures 3 and 4, in which latter case, two flanges 3and 4 will be formed, which may be of the same or of different width.

For shaping the tubular body, the combined layers formed by the strips Iand 2 is spirally wound on a suitable mandrel or core, by usingmachinery of known construction. 'Ihis operation is so performed thatthe material which forms the internal layer or lining 2, will bearranged toward the inner part of the strip I,

as shown in detail in Figure 5, and so as to cause the adjacent edges ofthe strip I to abut, taking care that the protruding edge formed by theflange 3 will be applied to the inner surface of the band 2 which formsthe lining layer of the next following Winding, as will be understoodwhen observing the details of Figure 6.

Previous to winding, the lateral edges of the strip I and the outer faceof the flange 3 may conveniently be coated with a suitable cementingmaterial, so that when spirally winding the elements I and 2, theadjacentedges of the element I will tightly adhere one to another, whilethe flange 3, in turn, will adhere to the layer of lining which formsthe next following winding.

The modified arrangement shown in Figure 7 consists in the fact that inthe construction of this ,type of tubular body the combined arrangementof layers shown in Figures 3 and 4 is used, wherein the lining bandprotrudes on both edges, in which case the operation according to thisprocess consists in applying, while Winding, one of the protruding edgesof the lining band 2, that for instance which forms the flange 3,against the internal face of the band of lining of the next followingturn, while the opposite fiange 4 is twisted upwardly so as to becomegripped between the adjacent edges of the strips I, the engagingsurfaces being joined by cementing or otherwise.

The modification shown in Figure 8 consists that the strip` I whichforms the tubular body, is formed by two or more layers obtained bysuccessively applying said strip on the lower layers, in form of spiralswound in opposite directions. It will be understood that in this case,the band 2 of lining material must be of sufficient length for coveringthe internal surface only of said body.

From the foregoing description, the manner of carrying the inventioninto practice will have clearly been understood and no furtherexplanations are deemed necessary for those skilled in the art.

Having now particularly described and ascertained the nature of myinvention and the manner in which the same is to be performed, I

declare that what I claimas new and desire to secure by Letters Patent,is: y

A process for making a helically wound paper tube Wound with a two-layerstrip comprising a relatively thick body strip and a relatively thinlining strip fastened together on their faces, consisting of the' stepsof adhesively fastening a said thin lining strip to said thick bodystrip narrower than said lining strip and with flange portions of saidlining strip on both sides thereof extending beyond both edges of theface of said thick body strip to which said lining strip is fastened.winding the two-layer strip so formed into a helical tube with saidlining strip on the inside of said tube and with a first said flangeportion of said lining strip on a given turn of the tube so extendingbeyondan edge of said thick body strip face extending over the liningstrip of an adjacent turn in its said position on the inside of saidthick body strip, bending the second said flange portion of said liningstrip on said given turn of the tube so extending beyond an edge of saidthick body strip face upwardly at right angles along an edge of saidthick body strip and terminating said bent flange portion substantiallyush with the outer face of said thick body strip for holding said bentflange portion between said edge of the heavy body strip of said giventurn and an edge of said thick body strip of a second adjacent turn toseal the radial joint between juxtaposed edges of the body str1p, andadhesively attaching said first extending flange portion to said liningstrip of said first mentioned turn to transversely seal the inner sideof the radial joint and also seal the lining strips of the adjacentturns.

CARLOS OBIGLIO.

